[Coin-lpsolver] Clp Build on AMD64

[Carl Wilburn]

My apologies if this is old stuff. I'm new to COIN.

I've just been building Clp on an HP AMD64 Laptop
running Fedora Core 3. The make uses the arch command
to establish architecture type. The command returns
x86_64 which errors out during the make. A man of gcc
indicates that it requires "k8" for this.  The
following addition to COIN/Makefiles/Makefile.Linux
seemed to work:

####add this at approximately line 30
ifeq ($(ARCH),x86_64)
	ARCH=k8
endif

I haven't had an opportunity to run a few examples,
but it built without errors.


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Carl Wilburn